Key lever mounting arrangement

ABSTRACT

A typewriter key lever bearing is rigidly secured to a wall by forming tabs on the end of the bearing which are received in slots formed in the wall and pressed thereagainst by the flexing of a resilient mounting plate in response to the tightening of a clamping device pressing both the mounting plate and the key lever bearing against the wall.

United States Patent 1191 Gels 1 1 July 10, 1973 KEY LEVER MOUNTINGARRANGEMENT 1,641,543 9/1927 [75] lnventor: Heinz Geis, Frankfurt/Main,Germany 2,713,386 7/1955 [73] Assignee: Adlerwerke vorrn. HeinrichKleyer M27920 3/1964 Aktiengesellschaft, Nuernberg,

Germany Primary Examiner-Edgar S. Burr 22 d; M 9, 1972 Attorney-JosephR. Spalla and Keith [)1 Moore [21] App1.No.: 251,741

r [57] ABSTRACT [52] US. Cl 197/98, 197/106, 248/27,

248/205 R, 285/189, 285/194, 287/203, 398/15 A typewriter key leverbearing is rigidly secured to a [51] Int. Cl B41 5/08 n by forming tabson the end of the hearing which [58] Search 7 0 are received in slotsformed in the wall and pressed 287/203 56; 248/27 205 R; 285/189thereagainst by the flexing of a resilient mounting plate 1793 194, 192;308/15 in response to the tightening of a clamping device pressing boththe mounting plate and the key lever [56] References Clted bearingagainst the wall.

UNITED STATES PATENTS I 847,835 3/1907 Secor 197/106 X j 2 Claims, 2Drawing Figures l: 23 'T I 2/ l }/9 '35 I 1 l 3/+\\ 37 l I 29 l I k if27 KEY LEVER MOUNTING ARRANGEMENT This invention relates to anarrangement for removably fastening a hollow key lever bearing to a wallof a business machine, and more particularly to an arrangement whichrigidly secures the key lever bearing to a wall of a typewriter frame insuch a manner as to prevent the fastening from being loosened by thestresses accompanying typing operations.

In a business machine, for example a typewriter, key lever bearings areused to support a portion of the mechanical linkages forming a type keyaction and undergo considerable stress during typing operations. In thepast, key lever bearings have been fastened to supporting walls by meansof anchor screws or screws and nuts. However, these fasteningarrangements have proved disadvantageous, because they do not impartsufficient rigidity to the key lever bearing and the wall of the machineand because they tend to loosen up due to the stresses and vibrationsaccompanying the typing movements.

Accordingly, an object of the present invention is to provide anarrangement for rigidly securing a hollow key lever bearing to a wall ofa business machine in I such a manner as to prevent loosening due to thestresses and vibrations accompanying typing movements.

Another object of the invention is toprovide an arrangement whichsimplifies the fastening of a hollow key lever bearing, in a rigidmanner, to a wall of a business machine.

Still other objects, features andadvantages of the present inventionwill become apparent to those skilled in the art from a reading of thefollowing detailed description of the invention, taken in conjunctionwith the accompanying drawing, wherein:

FIG. 1 is a vertical sectional view of a key lever bearing fastened to awall in accordance with the present invention; and

FIG. 2 is a topview of the key lever bearing shown in FIG. 1.

Referring now in detail to the figures in the drawing, there is shown,diagrammatically, an elongated key lever bearing, generally indicated11, for supporting.

portions of a typewriter key lever mechanism (not shown). As shown, thekey lever bearing 11 is hollow and formed by a wall member 13 having arectangular cross-sectional configuration with an edge portion 15 forabutting a wall 17 of a typewriter frame. The key lever bearing 11 maybe secured to the wall 17 of the typewriter by a suitable clamping meanswhich may desirably be in the form of a threaded screw, generallyindicated 19, which is received through an opening 20 formed in the wall17 with a head portion 21 of the screw 19 exerting a force against thewall 17 and with a threaded portion 23 of the screw 19 being threadablyreceived in a threaded portion, generally indicated 25, of the key leverbearing 11. As shown, the threaded portion 25 is in the form of athreaded nut which is secured by suitable means (not shown), to the wallmember 13 forming the key lever bearing 11. The portions of thetypewriter key lever mechanism supported by the key lever bearing 11 aswell as the means for securing the threaded portion 25 to the wallmember 13 of the key lever bearing 11 have been omitted from thedescription since they form no part of the present invention and may beconventional.

To provide means for firmly securing the key lever bearing 11 to thewall 17, the key lever bearing 11 is provided with tabs 27 extendingfrom the edge portion 15, and wall 17 is provided with spaced-apartslots, generally indicated at 29 and having inside and outside edges 31,33 respectively, for receiving the tabs 27. To firmly secure the keylever bearing 11 to the wall 17 of the typewriter frame so as to preventloosening of the connection as a result of alternating stresses andother vibrations accompanying typing operations, a resilient mountingplate, generally indicated 35, is located on the opposite side of thewall 17 with resilient arm portions 37 pressing the tabs 27 against thewall 17. As shown, the mounting plate 35 has an opening 39 through whichthe threaded screw 19 is received, and the resilient arm portions 37 areflexed and bent against the inside edges 31 of the slots 29 so as topress the tabs 27 against the outside edges 33 of the slots 29 as themounting plate 35 is pressed against the wall 17 by the head portion 21of the screw 19.

From the foregoing, it will be apparent that a key lever bearing 11 maybe easily and simply secured to the wall 17 of a typewriter inaccordance withthe above-described mounting arrangement. The end of thekeylever bearing 11 is placed against one side of the wall 17 with thetabs 27 inserted through the slots 29 and the edge portion 15 abuttingthe wall 17. Next, the mounting plate 35 is placed on the opposite sideof the wall 17 with the resilient arm portions 37 engaging the insideedges 31 of theslots 29. Finally, the threaded screw 19 is insertedthrough the hole 39 in the mounting plate 35 and the hole 20 in the wall17 and then threaded into the threaded portion 25 of the key leverbearing 11. The tightening of the screw 19 clamps the key lever bearing11 and the mounting plate 35 against thewall 17 and causes the resilientarms 37 to bend against the inside edges 31 of the slots 29 and pressthe tabs 27 against the outside edges 33 of the slots 29, therebyrigidly securing the key lever bearing 11 to the wall 17 of thetypewriter frame.

While only a single embodiment of the present invention has beenillustrated and described, it will be apparcut to those skilled in theart that various modifications and improvements may be made withoutdeparting from the scope and spirit of the invention. Accordingly, it isto be understood that the invention is not to be limited by theillustrative embodiment, but only by the scope of the depending claims.

What is claimed is:

1. ln abusiness machine, the combination comprising:

an elongated key lever bearing for supporting movable key levermechanism,

wall means for supporting said key lever bearing in said businessmachine,

said key lever bearing having an edge portion for abutting said wallmeans and tabs formed thereon extending beyond the edge portion,

said wall means defining spaced-apart slots with inside and outsideedges for receiving the tabs formed on said key lever bearing,

resilient means for engaging the tabs received in the slots defined bysaid wall means,

clamping means for clamping said key lever bearing 7 to said wall means,and

said resilient means being flexed in response to the clamping movementof said clamping means for resiliently pressing the tabs of said keylever bearing and a threaded screw having a head for engaging againstthe outside edges of the slots defined by the plate portion of saidresilient means, and

said wall means so as to rigidly secure said key said threaded screwbeing threadably received in the lever bearing to said wall means.threaded portion of said key lever bearing for 2. in a business machineaccording to claim 1: 5 drawing the edge of said key lever bearingagainst said resilient means being in the form of a plate porsaid wallmeans and drawing the plate portion of tion having resilient arms withintermediate porsaid resilient means towards said wall means so as tionsthereof being supported against the inside to flex the resilient armsagainst the inside edges of edges of the slots defined by said wallmeans, the slots and press the tabs against the outside said clampingmeans being in the form of a threaded edges of the slots.

portion rigidly secured to said key lever bearing

1. In a business machine, the combination comprising: an elongated keylever bearing for supporting movable key lever mechanisms, wall meansfor supporting said key lever bearing in said business machine, said keylever bearing having an edge portion for abutting said wall means andtabs formed thereon extending beyond the edge portion, said wall meansdefining spaced-apart slots with inside and outside edges for receivingthe tabs formed on said key lever bearing, resilient means for engagingthe tabs received in the slots defined by said wall means, clampingmeans for clamping said key lever bearing to said wall means, and saidresilient means being flexed in response to the clamping movement ofsaid clamping means for resiliently pressing the tabs of said key leverbearing against the outside edges of the slots defined by said wallmeans so as to rigidly secure said key lever bearing to said wall means.2. In a business machine according to claim 1: said resilient meansbeing in the form of a plate portion having resilient arms withintermediate portions thereof being supported against the inside edgesof the slots defined by saId wall means, said clamping means being inthe form of a threaded portion rigidly secured to said key lever bearingand a threaded screw having a head for engaging the plate portion ofsaid resilient means, and said threaded screw being threadably receivedin the threaded portion of said key lever bearing for drawing the edgeof said key lever bearing against said wall means and drawing the plateportion of said resilient means towards said wall means so as to flexthe resilient arms against the inside edges of the slots and press thetabs against the outside edges of the slots.